Prisoner's Dilemma, though -- if you're the only guy who participates, you end up worse off. It would take a reasonably large number to tip, and you get progressively worse off until a critical value is reached, as your trial will be delayed more.

I can't help thinking the payoffs ought not to be in Prisoners' Dilemma form though; i.e. there should be a realistic chance a defendant facing a mandatory minimum sentence most juries would consider excessive might expect to be acquitted by jury nullification.